You'll have to figure out what the deal is, or disable it in the driver.
The rfkill switch is either hardware or software. Yours is hardware,
so I'm guessing it's one of the GPIO lines on the PCIE bus. I don't
know how the intel driver figures out which GPIO line is rfkill and
pays attention to it; search for that error string in the if_iwn.c
driver. Chances are it's reading a register and disabling it in
software.

-a
On 30 January 2016 at 14:34, J.R. Oldroyd <f...@opal.com> wrote:
> I have just upgraded the wifi mini-PCIe adapters in some older model
> Toshiba laptops, specifically L305D and L675D models, to AR9280
> adapters. This in order to be able to use the 5 GHz band.
>
> On the L305D, everything is working well.
>
> But on the L675D, the AR9280 radio remains off. Switching the wifi
> adapter to an Intel 6200 actually reports:
> iwn0: radio is disabled by hardware switch
> They both probe and initialize normally in the dmesg and you can
> talk to them normally using ifconfig. It is just the radio that
> remains off.
>
> Thing is, the L675D does not have a hardware rfkill switch. It does
> have Fn+F8, however.
>
> I should note that two other wifi adapters, the original RTL8191SE
> and also an AR9285 do both work fine in the L675D. They do not seem
> to see a phantom rfkill switch! But, neither of these adapters
> support the 5 GHz band.
>
> Despite the RTL8191SE and AR9285 working, I figured that it would be
> useful to have Fn+F8 working so that I could check and toggle the
> radio state of the AT9280. I therefore set about updating
> acpi_toshiba.c to support the TOS1900 HID [1].
>
> I am still no closer, though. I was not able to enable the hotkey
> Fn+Fx support, so I've implemented a hw.acpi.toshiba.wireless_wifi
> sysctl which shows that the wifi is enabled and allows it to be
> toggled. Testing with one of the working adapters (AR9285) does show
> the wifi LED going on and off and the interface does pass or not-pass
> traffic accordingly. But, with the AR9280, the LED and the radio
> remain steadfastly off.
>
> I have studied the acpidump[2] and found that the relevant ACPI method
> (TOI0==0xFF00 TOI1==0x56) supports four devices:
> 0x0200 wifi
> 0x0800 unknown
> 0x2000 wwan (3G device, according to google)
> 0xFFFF unknown
>
> I have played with all of them, but still cannot get the AR9280 radio
> or the wifi LED on.
>
> I have not found any documentation, other than the Linux driver
> toshiba_acpi.c which provides no further help.
>
> Anyone have any thoughts about what is needed to enable the AR9280 (or
> Intel 6200) in the Toshiba L675D?
>
> Thanks,
> -jr
>
> [1] http://opal.com/jr/toshiba_l675d/acpi_toshiba.c
> [2] http://opal.com/jr/toshiba_l675d/toshiba_l675d.asl
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